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Label:ObjectiveIn the previous article, we analyzed how the query optimizer works, including: detailed operation steps of the query optimizer, analysis of filter conditions, optimization of index items, and other information.In this article we analyze the detection of several key indicator values in the course of our operation.These indicator values are analyzed to analyze the operation of the statement and to analyze how it is optimized.Through this
Index this block from the storage structure, there are 2 categories, clustered index and nonclustered index, and non-clustered index in the heap table or in the clustered Index table will affect its key value, this block can be detailed view of the second article of this ser
Read Catalogue Objective Technical preparation ObjectiveIn the previous article, we analyzed how the query optimizer works, including: detailed operation steps of the query optimizer, analysis of filter conditions, optimization of index items, and other information.In this article we analyze the detection of several key indicator values in the course of our operation.These indicator values are analyzed to analyze the operation of the
SQL Server Performance Tuning entry (graphic version) Step 1: capture sample data during business peaks(About 2 hours ). The tool used is the profiler that comes with sqlserver, also known as the event probe. For example, after entering, click the button on the leftmost side to create a new trail: DBO permission is required for logon, therefore, you can log on wi
to archive, partition, table sharding, etc) Software System (operating system optimization, database system configuration, resource planning and monitoring, etc) Hardware infrastructure (Device specifications, hardware performance, Server Load balancer, Disaster Tolerance, etc) SQL statement writing, indexing and statistics, transactions and locks, application access code (too many connections, frequent sw
indexes are fully utilized during execution. normally, if the index is fully utilized, the name of the execution step will be index seek. note: When analyzing Io, You need to execute the set statistics Io on statement to open the IO analysis.4. Based on the analysis results, add the corresponding indexes and reduce the I/O later.5. for stored procedures, the event viewer should be used to further filter th
In earlier articles, the detect methodology in performance tuning was mentioned, and the Detect methodology was briefly reviewed here.Discover the problem: finding problemsExplore The conditions: Reasons to exploreTrack down possible approaches: providing a possible solutionExecute the most likely approach: perform the best possible solutionCheck of Success: Confirm success (if not successful, repeat the above steps)Tie up Loose Ends: complete Remaini
through David Durante , 2013/01/25(first published: 2011/06/22) the seriesThis article is part of the stair series: Ladder index for SQL ServerThe basis of the index database design tells the developer to use the intent of the Database Designer. Unfortunately, the index is often followed by a performance problem that
decomposition, it seems necessary to sort out a directory ....SQL Server Tuning Series BasicsSQL Server Tuning Series Basics (Summary of common operators)SQL Server
Original article: StairwaytoSQLServerIndexes: Level2, DeeperintoNonclusteredIndexes this article is part of the advanced series of SQL Server indexes (StairwaytoSQLServerIndexes. In Level 1 Original article: StairwaytoSQLServerIndexes: Level2, DeeperintoNonclusteredIndexes this article is part of the advanced series of SQL Se
What happens in SQL Server that causes its execution plan to turn from index lookup to index Scan (index Scan)? The following from a few aspects of context-specific scenarios to do the next test, summary, induction. 1: An implicit conversion causes the execution plan to cha
whether you get rid of the query or not. Example The following query selects the names of all tables in the pubs database, and the clustered index (if any) for each table. If you do not have a clustered index, the table name still appears in the list and is displayed as a dashed line in the clustered index column. Two queries return the same result set, but th
Clustered index, data is actually stored in order, and the data page is on the index page. It is as if all topics are arranged in order in the reference manual. Once the data to be searched is found, the search is completed. For non-clustered indexes, the index is safe and independent from the data structure, and the data to be searched is found in the
same time, tracking different databases and tablesIf you are working with Database Engine Tuning Advisor for SQL, it's better to analyze your SQL statement performance if, and will tell you how to modify it would be better, let's have a look.How Database Engine Tuning Advisor is used With this tracking record, h
)) FROM Seq WHERE id Then we execute this stored procedure and insert the test data. SQL Server Management Studio records the operation time in the lower right corner of the output window. To be more intuitive, we manually wrote a statement that records the time, as shown below: DECLARE @ d datetimeSET @ d = getdate () print 'start to execute the stored procedure... 'exec pro_Count_Test; S
There are a couple of concepts to talk about before you start."Overwrite Query"When an index contains all the columns referenced by a query, it is often referred to as an "overwrite query.""Index Overlay"If the returned data column is contained in the key value of the index, or is contained in the key value of the index
Label:Source: When SQL Server creates a composite index, the composite index column order affects the performance of the query Talk about composite indexes Write index blog Too much, has not wanted to write, there are two reasons:One is the suspicion that there are fried lef
Some time ago, I had a performance problem with my website, and sometimes the page was very slow to open. It would take more than 10 seconds. I tried a lot of methods, including cache, disable viewstate, and Disable debug mode. The improvements were not obvious. Later, I ran into SQL Server Profiler to check the cause: a slow query dragged down the entire page. Later, the query was optimized, but not man
. Because the latter will not generate a large number of locked table scans or index scans.If you want to check whether a record exists in the table, do not use count (*) as inefficient and waste server resources. It can be replaced by exists. For example:If (select count (*) from table_name where column_name = 'xxx ')Can be written:If exists (select * From table_name where column_name = 'xxx ') You often
Full-text index query first performs word segmentation on the words to be queried, and then finds all rowids containing these words in the B tree that stores inverted indexes, based on the rowid, the row containing the data is filtered out in the B-tree that stores the actual data. A complete SQL Server full-text index
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